<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app-5">
        <p>{{ message }}</p>
        <button v-on:click="reverseMessage">反转消息</button>
      </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
    var app5 = new Vue({
        el: '#app-5',
        data: {
          message: 'Hello JunJun!'
        },
        methods: {
          reverseMessage: function () {
            this.message = this.message.split('').reverse().join('')
          }
        }
      })
    </script>
</body>
</html>